Process of producing printing-plates.



J. JAO OBSON. PROCESS OF PRODUCING PRINTING PLATES.

APPLICATION FILED MAY 18, 1008.

926,121. Patented June 29, 1909.

UNITED STATES @FFffCE...

JOHN JACOBSON, OF NEW YORK, N. Y., ASSIGNOR TO WEAVE-PRINT COMPANY, A CORPORA- TION OF NEW YORK.

PROCESS OF PRODUCING PRINTING-PLATES.

No. 926,12l. Specification of Letters Patent. Patented June 29, 19 09. I Application filed may 18, 1908. Serial No. 438,475.

To all whom it may concern: another, it is necessary to make two printing Be it known that If, JOHN Jacoesox, a plates, the printing surface of each correcitizen of the United States, residing in New sponding to the particular part of the design York, in the county of New York and State nhich to be reproduced therefrom. In 5 of New York, have invented an Improvement accordance with this invention, one of the in Processes of Producing Printing-Plates, patterns Bis first placed over th design and of which the following description, in corn where the portion a of the design shows nection with the accompanying drawings, through the operator rapidlylnushes some is a specification, like letters on the drawings opaque pigment which will settle in the de- 10 representing like parts. pressions and will not tend to llow over the The present invention relates to a process surface of the. pattern. Another pattern is of'producing printing plates and is embodied then placed over the design properly rcgisin an inexpensive process of producing from tercd with the first, and the part over the a single design a number of plates, each of portion of the design indicated by the refer- 15 which is adapted to print a portion of the once letter I) is traced as indicated in Fig. 3.

design, so that b successive impressions These tso plates can then be used in connecfrom the several p ates a color effect can be tion with any photographic process to make produced.v printing plates, each of which has a certain In accordance with the invention, a nurnportion conforming to a certain portion of bcr of transparent patterns are first prothe design for color printing by successive duced, these patterns having surfaces proimpressions. The use of the swelled gelatin vided with a large number of small and pattern assists in carrying out the process,

regularly spaced depressions which will hold as the non-oxidized raised portions of the an ink or pigment. The patterns properly gelatin surface are not adhered to by the 25 registered With relation to the design are pigment whi h remains 1n the depressions successively placed over the design, and that and does not tend to flow beyond the same. part of the design which is to be reproduced Furthermm'c, the printing plates made from on a single plate may be rapidly traced with the patterns have a printing surface which,

a brush, the small depressions confining and when reproduced, is in imitation of a woven 3O locating the pigment, so that the process can falni-qr, owing to the fact that the actual out be rapidly carried out without exercising line of the d sign, instead of being an exact great care in following the outline to be reproductionoflhcoriginaldesign,is slightly traced. These transparent patterns may irregular, owing to the fact that the entire be made by a photographic process, the body of the design is made up of minute 35 swelled gelatin process being )referably em squares.

ployed, a plate beingprod need in accordance Claim. with this process from a ruled line surface The herein dcscrihcd process of obtaining similar in appearance to a half tone screen. printing surfaces which consists in making By exposing the sensitized gelatin plate to a transparent patterns having surfaces pro- 40 positive made fromsnch a screen, the spaces vidcd. with regularly spaced square dopres )etween therlines will be oxidized, so that i sions; placing said pallcrus over the design when the gelatin is soaked in water the lir-cs I to be reproduced; tracing with pigment that will swell, thus )roducing the regular de part of the design which is to be reproduced pressions above described. l on a printing surface; and pliotographically 45 Figurel is a plan View of a transparent I producing the printing surface from the patpattern of the kind used in carrying out the torn thus traced. invention; and Figs. 2 and 3 are views of the In testimony whereof, have signed my pattern placed over a design WlllCll 18 to be name to thisspecification in the presence of reproilhced. two subscribing witnesses. 50. Assiilining, for example, that the design JOHN JACOBSON.

indicated by the reference letter A is to be W il'nesscs: reproduced in two different colors, thepor- A. ll. Mo'ruci', Jin, tion a of one color and the portion 0 oil AUous'r Zinssnu, Jr. 

